Re: [PATCH 3/4] soc: Mediatek: Add SCPSYS power domain driver

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On Mon, Jun 22, 2015 at 2:35 PM, Sascha Hauer <s.hauer@xxxxxxxxxxxxxx> wrote:
> This adds a power domain driver for the Mediatek SCPSYS unit.
>
> The System Control Processor System (SCPSYS) has several power
> management related tasks in the system. The tasks include thermal
> measurement, dynamic voltage frequency scaling (DVFS), interrupt
> filter and lowlevel sleep control. The System Power Manager (SPM)
> inside the SCPSYS is for the MTCMOS power domain control.
>
> For now this driver only adds power domain support, the more
> advanced features are not yet supported. The driver implements
> the generic PM domain device tree bindings, the first user will
> most likely be the Mediatek AFE audio driver.
>
> Signed-off-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
> ---
>  drivers/soc/mediatek/Kconfig             |  10 +
>  drivers/soc/mediatek/Makefile            |   1 +
>  drivers/soc/mediatek/mtk-scpsys.c        | 487 +++++++++++++++++++++++++++++++
>  include/dt-bindings/power/mt8173-power.h |  15 +
>  4 files changed, 513 insertions(+)
>  create mode 100644 drivers/soc/mediatek/mtk-scpsys.c
>  create mode 100644 include/dt-bindings/power/mt8173-power.h
>
> diff --git a/drivers/soc/mediatek/Kconfig b/drivers/soc/mediatek/Kconfig
> index e4f37a3..32eff1b 100644
> --- a/drivers/soc/mediatek/Kconfig
> +++ b/drivers/soc/mediatek/Kconfig
> @@ -18,3 +18,13 @@ config MTK_PMIC_WRAP
>           Say yes here to add support for MediaTek PMIC Wrapper found
>           on different MediaTek SoCs. The PMIC wrapper is a proprietary
>           hardware to connect the PMIC.
> +
> +config MTK_SCPSYS
> +       bool "MediaTek SCPSYS Support"
> +       depends on ARCH_MEDIATEK || COMPILE_TEST
> +       select REGMAP
> +       select MTK_INFRACFG
> +       select PM_GENERIC_DOMAINS if PM
> +       help
> +         Say yes here to add support for the MediaTek SCPSYS power domain
> +         driver.
> diff --git a/drivers/soc/mediatek/Makefile b/drivers/soc/mediatek/Makefile
> index 3fa940f..12998b0 100644
> --- a/drivers/soc/mediatek/Makefile
> +++ b/drivers/soc/mediatek/Makefile
> @@ -1,2 +1,3 @@
>  obj-$(CONFIG_MTK_INFRACFG) += mtk-infracfg.o
>  obj-$(CONFIG_MTK_PMIC_WRAP) += mtk-pmic-wrap.o
> +obj-$(CONFIG_MTK_SCPSYS) += mtk-scpsys.o
> diff --git a/drivers/soc/mediatek/mtk-scpsys.c b/drivers/soc/mediatek/mtk-scpsys.c
> new file mode 100644
> index 0000000..84c306a
> --- /dev/null
> +++ b/drivers/soc/mediatek/mtk-scpsys.c
> @@ -0,0 +1,487 @@
> +/*
> + * Copyright (c) 2015 Pengutronix, Sascha Hauer <kernel@xxxxxxxxxxxxxx>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +#include <linux/clk.h>
> +#include <linux/delay.h>
> +#include <linux/io.h>
> +#include <linux/kernel.h>
> +#include <linux/mfd/syscon.h>
> +#include <linux/of_device.h>
> +#include <linux/platform_device.h>
> +#include <linux/pm_domain.h>
> +#include <linux/regmap.h>
> +#include <linux/soc/mediatek/infracfg.h>
> +#include <dt-bindings/power/mt8173-power.h>
> +
> +#define SPM_VDE_PWR_CON                        0x0210
> +#define SPM_MFG_PWR_CON                        0x0214
> +#define SPM_VEN_PWR_CON                        0x0230
> +#define SPM_ISP_PWR_CON                        0x0238
> +#define SPM_DIS_PWR_CON                        0x023c
> +#define SPM_VEN2_PWR_CON               0x0298
> +#define SPM_AUDIO_PWR_CON              0x029c
> +#define SPM_MFG_2D_PWR_CON             0x02c0
> +#define SPM_MFG_ASYNC_PWR_CON          0x02c4
> +#define SPM_USB_PWR_CON                        0x02cc
> +#define SPM_PWR_STATUS                 0x060c
> +#define SPM_PWR_STATUS_2ND             0x0610
> +
> +#define PWR_RST_B_BIT                  BIT(0)
> +#define PWR_ISO_BIT                    BIT(1)
> +#define PWR_ON_BIT                     BIT(2)
> +#define PWR_ON_2ND_BIT                 BIT(3)
> +#define PWR_CLK_DIS_BIT                        BIT(4)
> +
> +#define PWR_STATUS_DISP                        BIT(3)
> +#define PWR_STATUS_MFG                 BIT(4)
> +#define PWR_STATUS_ISP                 BIT(5)
> +#define PWR_STATUS_VDEC                        BIT(7)
> +#define PWR_STATUS_VENC_LT             BIT(20)
> +#define PWR_STATUS_VENC                        BIT(21)
> +#define PWR_STATUS_MFG_2D              BIT(22)
> +#define PWR_STATUS_MFG_ASYNC           BIT(23)
> +#define PWR_STATUS_AUDIO               BIT(24)
> +#define PWR_STATUS_USB                 BIT(25)
> +
> +enum clk_id {
> +       MT8173_CLK_NONE,
> +       MT8173_CLK_MM,
> +       MT8173_CLK_MFG,
> +       MT8173_CLK_MAX = MT8173_CLK_MFG,

This sets MT8173_CLK_MAX = 2 ...

> +};
> +
> +struct scp_domain_data {
> +       const char *name;
> +       u32 sta_mask;
> +       int ctl_offs;
> +       u32 sram_pdn_bits;
> +       u32 sram_pdn_ack_bits;
> +       u32 bus_prot_mask;
> +       enum clk_id clk_id;
> +};
> +
> +static const struct scp_domain_data scp_domain_data[] __initconst = {
> +       [MT8173_POWER_DOMAIN_VDEC] = {
> +               .name = "vdec",
> +               .sta_mask = PWR_STATUS_VDEC,
> +               .ctl_offs = SPM_VDE_PWR_CON,
> +               .sram_pdn_bits = GENMASK(11, 8),
> +               .sram_pdn_ack_bits = GENMASK(12, 12),
> +               .clk_id = MT8173_CLK_MM,
> +       },
> +       [MT8173_POWER_DOMAIN_VENC] = {
> +               .name = "venc",
> +               .sta_mask = PWR_STATUS_VENC,
> +               .ctl_offs = SPM_VEN_PWR_CON,
> +               .sram_pdn_bits = GENMASK(11, 8),
> +               .sram_pdn_ack_bits = GENMASK(15, 12),
> +               .clk_id = MT8173_CLK_MM,
> +       },
> +       [MT8173_POWER_DOMAIN_ISP] = {
> +               .name = "isp",
> +               .sta_mask = PWR_STATUS_ISP,
> +               .ctl_offs = SPM_ISP_PWR_CON,
> +               .sram_pdn_bits = GENMASK(11, 8),
> +               .sram_pdn_ack_bits = GENMASK(13, 12),
> +               .clk_id = MT8173_CLK_MM,
> +       },
> +       [MT8173_POWER_DOMAIN_MM] = {
> +               .name = "mm",
> +               .sta_mask = PWR_STATUS_DISP,
> +               .ctl_offs = SPM_DIS_PWR_CON,
> +               .sram_pdn_bits = GENMASK(11, 8),
> +               .sram_pdn_ack_bits = GENMASK(12, 12),
> +               .clk_id = MT8173_CLK_MM,
> +               .bus_prot_mask = MT8173_TOP_AXI_PROT_EN_MM_M0 |
> +                       MT8173_TOP_AXI_PROT_EN_MM_M1,
> +       },
> +       [MT8173_POWER_DOMAIN_VENC_LT] = {
> +               .name = "venc_lt",
> +               .sta_mask = PWR_STATUS_VENC_LT,
> +               .ctl_offs = SPM_VEN2_PWR_CON,
> +               .sram_pdn_bits = GENMASK(11, 8),
> +               .sram_pdn_ack_bits = GENMASK(15, 12),
> +               .clk_id = MT8173_CLK_MM,
> +       },
> +       [MT8173_POWER_DOMAIN_AUDIO] = {
> +               .name = "audio",
> +               .sta_mask = PWR_STATUS_AUDIO,
> +               .ctl_offs = SPM_AUDIO_PWR_CON,
> +               .sram_pdn_bits = GENMASK(11, 8),
> +               .sram_pdn_ack_bits = GENMASK(15, 12),
> +               .clk_id = MT8173_CLK_NONE,
> +       },
> +       [MT8173_POWER_DOMAIN_USB] = {
> +               .name = "usb",
> +               .sta_mask = PWR_STATUS_USB,
> +               .ctl_offs = SPM_USB_PWR_CON,
> +               .sram_pdn_bits = GENMASK(11, 8),
> +               .sram_pdn_ack_bits = GENMASK(15, 12),
> +               .clk_id = MT8173_CLK_NONE,
> +       },
> +       [MT8173_POWER_DOMAIN_MFG_ASYNC] = {
> +               .name = "mfg_async",
> +               .sta_mask = PWR_STATUS_MFG_ASYNC,
> +               .ctl_offs = SPM_MFG_ASYNC_PWR_CON,
> +               .sram_pdn_bits = GENMASK(11, 8),
> +               .sram_pdn_ack_bits = 0,
> +               .clk_id = MT8173_CLK_MFG,
> +       },
> +       [MT8173_POWER_DOMAIN_MFG_2D] = {
> +               .name = "mfg_2d",
> +               .sta_mask = PWR_STATUS_MFG_2D,
> +               .ctl_offs = SPM_MFG_2D_PWR_CON,
> +               .sram_pdn_bits = GENMASK(11, 8),
> +               .sram_pdn_ack_bits = GENMASK(13, 12),
> +               .clk_id = MT8173_CLK_NONE,
> +       },
> +       [MT8173_POWER_DOMAIN_MFG] = {
> +               .name = "mfg",
> +               .sta_mask = PWR_STATUS_MFG,
> +               .ctl_offs = SPM_MFG_PWR_CON,
> +               .sram_pdn_bits = GENMASK(13, 8),
> +               .sram_pdn_ack_bits = GENMASK(21, 16),
> +               .clk_id = MT8173_CLK_NONE,
> +               .bus_prot_mask = MT8173_TOP_AXI_PROT_EN_MFG_S |
> +                       MT8173_TOP_AXI_PROT_EN_MFG_M0 |
> +                       MT8173_TOP_AXI_PROT_EN_MFG_M1 |
> +                       MT8173_TOP_AXI_PROT_EN_MFG_SNOOP_OUT,
> +       },
> +};
> +
> +#define NUM_DOMAINS    ARRAY_SIZE(scp_domain_data)
> +
> +struct scp;
> +
> +struct scp_domain {
> +       struct generic_pm_domain genpd;
> +       struct scp *scp;
> +       struct clk *clk;
> +       u32 sta_mask;
> +       void __iomem *ctl_addr;
> +       u32 sram_pdn_bits;
> +       u32 sram_pdn_ack_bits;
> +       u32 bus_prot_mask;
> +};
> +
> +struct scp {
> +       struct scp_domain domains[NUM_DOMAINS];
> +       struct genpd_onecell_data pd_data;
> +       struct device *dev;
> +       void __iomem *base;
> +       struct regmap *infracfg;
> +};
> +
> +static int scpsys_domain_is_on(struct scp_domain *scpd)
> +{
> +       struct scp *scp = scpd->scp;
> +
> +       u32 status = readl(scp->base + SPM_PWR_STATUS) & scpd->sta_mask;
> +       u32 status2 = readl(scp->base + SPM_PWR_STATUS_2ND) & scpd->sta_mask;
> +
> +       /*
> +        * A domain is on when both status bits are set. If only one is set
> +        * return an error. This happens while powering up a domain
> +        */
> +
> +       if (status && status2)
> +               return true;
> +       if (!status && !status2)
> +               return false;
> +
> +       return -EINVAL;
> +}
> +
> +static int scpsys_power_on(struct generic_pm_domain *genpd)
> +{
> +       struct scp_domain *scpd = container_of(genpd, struct scp_domain, genpd);
> +       struct scp *scp = scpd->scp;
> +       unsigned long timeout;
> +       bool expired;
> +       void __iomem *ctl_addr = scpd->ctl_addr;
> +       u32 sram_pdn_ack = scpd->sram_pdn_ack_bits;
> +       u32 val;
> +       int ret;
> +
> +       if (scpd->clk) {
> +               ret = clk_prepare_enable(scpd->clk);
> +               if (ret)
> +                       goto err_clk;
> +       }
> +
> +       val = readl(ctl_addr);
> +       val |= PWR_ON_BIT;
> +       writel(val, ctl_addr);
> +       val |= PWR_ON_2ND_BIT;
> +       writel(val, ctl_addr);
> +
> +       /* wait until PWR_ACK = 1 */
> +       timeout = jiffies + HZ;
> +       expired = false;
> +       while (1) {
> +               ret = scpsys_domain_is_on(scpd);
> +               if (ret > 0)
> +                       break;
> +
> +               if (expired) {
> +                       ret = -ETIMEDOUT;
> +                       goto err_pwr_ack;
> +               }
> +
> +               cpu_relax();
> +
> +               if (time_after(jiffies, timeout))
> +                       expired = true;
> +       }
> +
> +       val &= ~PWR_CLK_DIS_BIT;
> +       writel(val, ctl_addr);
> +
> +       val &= ~PWR_ISO_BIT;
> +       writel(val, ctl_addr);
> +
> +       val |= PWR_RST_B_BIT;
> +       writel(val, ctl_addr);
> +
> +       val &= ~scpd->sram_pdn_bits;
> +       writel(val, ctl_addr);
> +
> +       /* wait until SRAM_PDN_ACK all 0 */
> +       timeout = jiffies + HZ;
> +       expired = false;
> +       while (sram_pdn_ack && (readl(ctl_addr) & sram_pdn_ack)) {
> +
> +               if (expired) {
> +                       ret = -ETIMEDOUT;
> +                       goto err_pwr_ack;
> +               }
> +
> +               cpu_relax();
> +
> +               if (time_after(jiffies, timeout))
> +                       expired = true;
> +       }
> +
> +       if (scpd->bus_prot_mask) {
> +               ret = mtk_infracfg_clear_bus_protection(scp->infracfg,
> +                               scpd->bus_prot_mask);
> +               if (ret)
> +                       goto err_pwr_ack;
> +       }
> +
> +       return 0;
> +
> +err_pwr_ack:
> +       clk_disable_unprepare(scpd->clk);
> +err_clk:
> +       dev_err(scp->dev, "Failed to power on domain %s\n", genpd->name);
> +
> +       return ret;
> +}
> +
> +static int scpsys_power_off(struct generic_pm_domain *genpd)
> +{
> +       struct scp_domain *scpd = container_of(genpd, struct scp_domain, genpd);
> +       struct scp *scp = scpd->scp;
> +       unsigned long timeout;
> +       bool expired;
> +       void __iomem *ctl_addr = scpd->ctl_addr;
> +       u32 pdn_ack = scpd->sram_pdn_ack_bits;
> +       u32 val;
> +       int ret;
> +
> +       if (scpd->bus_prot_mask) {
> +               ret = mtk_infracfg_set_bus_protection(scp->infracfg,
> +                               scpd->bus_prot_mask);
> +               if (ret)
> +                       goto out;
> +       }
> +
> +       val = readl(ctl_addr);
> +       val |= scpd->sram_pdn_bits;
> +       writel(val, ctl_addr);
> +
> +       /* wait until SRAM_PDN_ACK all 1 */
> +       timeout = jiffies + HZ;
> +       expired = false;
> +       while (pdn_ack && (readl(ctl_addr) & pdn_ack) != pdn_ack) {
> +               if (expired) {
> +                       ret = -ETIMEDOUT;
> +                       goto out;
> +               }
> +
> +               cpu_relax();
> +
> +               if (time_after(jiffies, timeout))
> +                       expired = true;
> +       }
> +
> +       val |= PWR_ISO_BIT;
> +       writel(val, ctl_addr);
> +
> +       val &= ~PWR_RST_B_BIT;
> +       writel(val, ctl_addr);
> +
> +       val |= PWR_CLK_DIS_BIT;
> +       writel(val, ctl_addr);
> +
> +       val &= ~PWR_ON_BIT;
> +       writel(val, ctl_addr);
> +
> +       val &= ~PWR_ON_2ND_BIT;
> +       writel(val, ctl_addr);
> +
> +       /* wait until PWR_ACK = 0 */
> +       timeout = jiffies + HZ;
> +       expired = false;
> +       while (1) {
> +               ret = scpsys_domain_is_on(scpd);
> +               if (ret == 0)
> +                       break;
> +
> +               if (expired) {
> +                       ret = -ETIMEDOUT;
> +                       goto out;
> +               }
> +
> +               cpu_relax();
> +
> +               if (time_after(jiffies, timeout))
> +                       expired = true;
> +       }
> +
> +       if (scpd->clk)
> +               clk_disable_unprepare(scpd->clk);
> +
> +       return 0;
> +
> +out:
> +       dev_err(scp->dev, "Failed to power off domain %s\n", genpd->name);
> +
> +       return ret;
> +}
> +
> +static int __init scpsys_probe(struct platform_device *pdev)
> +{
> +       struct genpd_onecell_data *pd_data;
> +       struct resource *res;
> +       int i, ret;
> +       struct scp *scp;
> +       struct clk *clk[MT8173_CLK_MAX];

So ARRAY_SIZE(clk) == 2 ...

> +
> +       scp = devm_kzalloc(&pdev->dev, sizeof(*scp), GFP_KERNEL);
> +       if (!scp)
> +               return -ENOMEM;
> +
> +       scp->dev = &pdev->dev;
> +
> +       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +       scp->base = devm_ioremap_resource(&pdev->dev, res);
> +       if (IS_ERR(scp->base))
> +               return PTR_ERR(scp->base);
> +
> +       pd_data = &scp->pd_data;
> +
> +       pd_data->domains = devm_kzalloc(&pdev->dev,
> +                       sizeof(*pd_data->domains) * NUM_DOMAINS, GFP_KERNEL);
> +       if (!pd_data->domains)
> +               return -ENOMEM;
> +
> +       clk[MT8173_CLK_MM] = devm_clk_get(&pdev->dev, "mm");

here we want to access:
   clk[MT8173_CLK_MM]  == clk[1]

> +       if (IS_ERR(clk[MT8173_CLK_MM]))
> +               return PTR_ERR(clk[MT8173_CLK_MM]);
> +
> +       clk[MT8173_CLK_MFG] = devm_clk_get(&pdev->dev, "mfg");

and here...
   clk[MT8173_CLK_MFG] == clk[2]

oops.

> +       if (IS_ERR(clk[MT8173_CLK_MFG]))
> +               return PTR_ERR(clk[MT8173_CLK_MFG]);
> +
> +       scp->infracfg = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
> +                       "infracfg");
> +       if (IS_ERR(scp->infracfg)) {
> +               dev_err(&pdev->dev, "Cannot find infracfg controller: %ld\n",
> +                               PTR_ERR(scp->infracfg));
> +               return PTR_ERR(scp->infracfg);
> +       }
> +
> +       pd_data->num_domains = NUM_DOMAINS;
> +
> +       for (i = 0; i < NUM_DOMAINS; i++) {
> +               struct scp_domain *scpd = &scp->domains[i];
> +               struct generic_pm_domain *genpd = &scpd->genpd;
> +               const struct scp_domain_data *data = &scp_domain_data[i];
> +
> +               pd_data->domains[i] = genpd;
> +               scpd->scp = scp;
> +
> +               scpd->sta_mask = data->sta_mask;
> +               scpd->ctl_addr = scp->base + data->ctl_offs;
> +               scpd->sram_pdn_bits = data->sram_pdn_bits;
> +               scpd->sram_pdn_ack_bits = data->sram_pdn_ack_bits;
> +               scpd->bus_prot_mask = data->bus_prot_mask;
> +               if (data->clk_id != MT8173_CLK_NONE)
> +                       scpd->clk = clk[data->clk_id];

(and here)

-Dan

> +
> +               genpd->name = data->name;
> +               genpd->power_off = scpsys_power_off;
> +               genpd->power_on = scpsys_power_on;
> +
> +               /*
> +                * Initially turn on all domains to make the domains usable
> +                * with !CONFIG_PM and to get the hardware in sync with the
> +                * software.  The unused domains will be switched off during
> +                * late_init time.
> +                */
> +               genpd->power_on(genpd);
> +
> +               pm_genpd_init(genpd, NULL, false);
> +       }
> +
> +       /*
> +        * We are not allowed to fail here since there is no way to unregister
> +        * a power domain. Once registered above we have to keep the domains
> +        * valid.
> +        */
> +
> +       ret = pm_genpd_add_subdomain(pd_data->domains[MT8173_POWER_DOMAIN_MFG_ASYNC],
> +               pd_data->domains[MT8173_POWER_DOMAIN_MFG_2D]);
> +       if (ret && IS_ENABLED(CONFIG_PM))
> +               dev_err(&pdev->dev, "Failed to add subdomain: %d\n", ret);
> +
> +       ret = pm_genpd_add_subdomain(pd_data->domains[MT8173_POWER_DOMAIN_MFG_2D],
> +               pd_data->domains[MT8173_POWER_DOMAIN_MFG]);
> +       if (ret && IS_ENABLED(CONFIG_PM))
> +               dev_err(&pdev->dev, "Failed to add subdomain: %d\n", ret);
> +
> +       ret = of_genpd_add_provider_onecell(pdev->dev.of_node, pd_data);
> +       if (ret)
> +               dev_err(&pdev->dev, "Failed to add OF provider: %d\n", ret);
> +
> +       return 0;
> +}
> +
> +static const struct of_device_id of_scpsys_match_tbl[] = {
> +       {
> +               .compatible = "mediatek,mt8173-scpsys",
> +       }, {
> +               /* sentinel */
> +       }
> +};
> +
> +static struct platform_driver scpsys_drv = {
> +       .driver = {
> +               .name = "mtk-scpsys",
> +               .owner = THIS_MODULE,
> +               .of_match_table = of_match_ptr(of_scpsys_match_tbl),
> +       },
> +};
> +
> +module_platform_driver_probe(scpsys_drv, scpsys_probe);
> diff --git a/include/dt-bindings/power/mt8173-power.h b/include/dt-bindings/power/mt8173-power.h
> new file mode 100644
> index 0000000..b34cee9
> --- /dev/null
> +++ b/include/dt-bindings/power/mt8173-power.h
> @@ -0,0 +1,15 @@
> +#ifndef _DT_BINDINGS_POWER_MT8183_POWER_H
> +#define _DT_BINDINGS_POWER_MT8183_POWER_H
> +
> +#define MT8173_POWER_DOMAIN_VDEC       0
> +#define MT8173_POWER_DOMAIN_VENC       1
> +#define MT8173_POWER_DOMAIN_ISP                2
> +#define MT8173_POWER_DOMAIN_MM         3
> +#define MT8173_POWER_DOMAIN_VENC_LT    4
> +#define MT8173_POWER_DOMAIN_AUDIO      5
> +#define MT8173_POWER_DOMAIN_USB                6
> +#define MT8173_POWER_DOMAIN_MFG_ASYNC  7
> +#define MT8173_POWER_DOMAIN_MFG_2D     8
> +#define MT8173_POWER_DOMAIN_MFG                9
> +
> +#endif /* _DT_BINDINGS_POWER_MT8183_POWER_H */
> --
> 2.1.4
>
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